Machine tool



April 1941- F. TURRETTINI I Y 3 ,2

I MACHINE TOOL Filed April 25, 1939 ll 1 lg 33 III:-

Patented Apr. 22, 1941 amass MACHINE TOOL Fernand Turrettini,Bellevue-Geneva, Switzerland, assignor to Soeiete Genevoise dInstrumentsde Physique, Geneva, Switzerland, a firm of Switzerland ApplicationApril 25, 1939, Serial No. 270,007

In Switzerland May 2, 1938 2 Claims.

The present invention relates to machine tools and more particularly toa type thereof com imparting the axial spindle motion upon the slide,and the provision of at least one transmission device over which saidconnecting organ is passing.

In the accompanying drawing one embodiment view.

The single figure is a vertical section thereof along the axis of thetool spindle.

In this figure: i is the holding spindle frame, 2 is the quill, and 3 isthe turning tool holding spindle, the rack 4 and the pinion 5 controlthe motion of the quill 2 and must overcome the axial reaction of theboring tool 6. The motion of thefquill 2 is transmitted to a slide II)which is movable in the guideways ll of the holding spindle frame I bymeans of a steel strip I which-passes over two idlers 8 and 8 providedwith ball bearings, and one extremity of which is attached to the slideI0, whereas the other one is attached to the quill 2. The slide moves intheg- 7guideways II for the same feed length as thfquill 2, and onaccount of the idlers 8 and 9, in the same direction, a matter whichfrom the synoptical point of view is of advantage. The steel strip hasonly a small effort to transmit and the two idlers 8 and 9 beingprovided with ball bearings, the slide it! will exactly reproduce theaxial displacements of the quill 2. The tension of the strip '1 isobtained by the weight the slide; should this latter move horizontally asuitable spring would be ioreseen.

In front of the slide ill a carriage I2 is arranged which-moves inguideways l3 parallel to those H of the slide [0. This slide is providedwith a dial indicator II, the feeler l 0! which of the invention isillustrated by a schematic placing upon it the setting parallel gaugeblocks. The position of the abutment table I8 is controlled by amicrometer setting screw it. penetrating in the tapped hole of the slideH which moves also in the guideways l3 and can be locked at any point ofthe guideways by a clamping button I8.

For setting, the slide I2 is made solid to the slide it! by means oispring piston l9; in lifting the plug it the carriage I2 is stopped andis thus not unnecessarily submitted to wear.

Iclaim:

1. In a machine tool, a spindle support, an axially displaceable androtatable tool spindle, a quill rigid with said spindle for axialdisplacements, a slide movable along a guideway disposed externally onthe support and parallelly to the spindle axis, a flexiblegalthoughnon-extensible pulling organ connecting said slide with the quill forimparting equal feed from the sleeve upon the slide, at least onetransmission device over which said flexible pulling organ is passing, acarriage displaceable on the spindle support parallelly to the slide andadapted to be temporarily fixed to the latter, and a dial indicatordisposed on said carriage to allow measuring of the feed.

2. In a machine tool, a spindle support, an axially displaceable androtatable tool spindle, a quill rigid with said spindle for axialdisplacements, a slide movable along a guideway disposed externally onthe support and parallelly to the spindle axis, a flexible, althoughnonextensible pulling organ connecting said slide with the quill forimparting'equal feed from the sleeve upon the slide, at least onetransmissiondevice over which said flexible pulling organ is, passing, acarriage displaceable on the spindle support parallelly to the slide andadapted to be temporarily fixed to the latter, an abutting body mountedon the support and being displaceable in the same directions as saidcarriage, a micrometer setting screw carried by said bodyw for accurateadjustment of the position of the abutment, and a dial indicatordisposed on said carriage and adapted to co-operate with saidco-operates with a small table I8 arranged tor abutment for measuringthe feed.

